SOLUTION: Kim’s average score on her first three math tests is 78. She scored 63 on the first test. On the third test, she scored 9 more than he scored on her second test. What did she score

Algebra ->  Average -> SOLUTION: Kim’s average score on her first three math tests is 78. She scored 63 on the first test. On the third test, she scored 9 more than he scored on her second test. What did she score      Log On


   



Question 315550: Kim’s average score on her first three math tests is 78. She scored 63 on the first test. On the third test, she scored 9 more than he scored on her second test. What did she score on the second and third tests? Set up an equation, then solve and explain.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let S be the score from the second test, T the score from the third.
+%2863%2BT%2BS%29%2F3=78
+63%2BT%2BS=234
.
.
+T=S%2B9
+63%2B%28S%2B9%29%2BS=234
+2S%2B72=234
+2S=162
+highlight%28S=81%29
Then from above,
+T=S%2B9
+T=81%2B9
+highlight%28T=90%29+